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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 1 — Jan. 1, 2007
  • pp: 44–49

Simple focal-length measurement technique with a circular Dammann grating

Shuai Zhao, Jacky Fung Wen, and Po Sheun Chung  »View Author Affiliations


Applied Optics, Vol. 46, Issue 1, pp. 44-49 (2007)
http://dx.doi.org/10.1364/AO.46.000044


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Abstract

A novel technique for focal-length measurements with a circular Dammann grating is presented. In the back focal plane of the lens under test, a one-order circular Dammann grating with limited aperture will produce double-humped radial rings. The separation between the two lobes varies with the displacement of the observed plane from the focal plane of the lens. By searching for the position at which the separation is minimal, the focal point of the lens can be located and hence the back focal length can be determined. Experimental results demonstrated that this method is efficient and can be used effectively for a quick check of focal length.

© 2007 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(220.4840) Optical design and fabrication : Testing

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: June 23, 2006
Revised Manuscript: August 13, 2006
Manuscript Accepted: August 19, 2006

Citation
Shuai Zhao, Jacky Fung Wen, and Po Sheun Chung, "Simple focal-length measurement technique with a circular Dammann grating," Appl. Opt. 46, 44-49 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-1-44

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